Putty is great for developing Fine Motor Skills (Occupational Therapists Love it) it never dries out, has no odour and leaves no greasy feel on hands, it’s non-toxic and safe for children three years and older. Metallics and glitter puttys are the softest in our putty collection so for poor fine motor skills this is the best. Our medium strength is similar to blu tac and is our heat sensitive putty so this changes colour as its played with more perfect for occupational therapists trying to make fine motor skill activities more fun. Our toughest is our Glow in the Dark Putty this is really tough and gives your hands a real work out using it.